Role Gut Bacteria Play in Body's Self-Defense (All these years we have been advocating that immunity is based on the good bacteria balance over bad bacteria, brough about by castor oil and gall nut cleansing. Modern science is now taking its baby steps in understanding this timeless wisdom. Modern science was thinking immunity is based on just the vitmain nutrients. The Timeless Vedic wisdon says five factors are involved in our immunity. Modern scien ce knows only two factors and yet to discover other 3).